|Quoting GZed (Reply 207):|
Why do you keep suggesting that deviations from straight flight are not possible because it would result in the plane not having enough fuel to make it to "the last know ping arc"? You've mentioned something like this 3 or 4 times, incorrectly. You seem to summarize that the plane must have flown straight because otherwise if would not have had enough fuel to make it to the estimated end point along the arc.
In actual fact its their assumption that it flew in a straight line that results in their final location guesstimate. If it didn't fly in a straight line then it could have ended up anywhere along the red line by 8:11am.
The entire red line uses a basically direct flight assumption just one at the minimum speed and another at the maximum speed. If you make a significant deviation from a direct at cruise altitude flight (say trying to hide from radar by flying nap of the earth style or shadowing another plane and following it off to the west and then turning back to the east) it wouldn't be possible to reach the line at any point. (Near the short end you could in theory fly past it a maximum speed and then turn back but you would still have to end up somewhere on the line)
Your getting confused by the lines and my discussion about the beyond the red arc north west conspiracy theories, if you do a crazy zig zag or land on the ground there is no way to reach the same arc in the areas discussed. Some deviations are allowed and it depends on where your looking at but at the furthest point on the arc you must travel in a mostly direct path as there isn't enough fuel to do anything else. (The parts of the arc where the distance to the last known point is short has more room for crazy manoeuvres but luckily those are well away from any conspiracy theories)
Or to make things simpler if you want to end up in the last ping area's furthest point from the start you must travel in a direct path. If you want to land on the arc at any point before this furthest point your limited by the same length cord to the outermost point and can draw whatever line you like provided it doesn't exceed the length (fuel of the plane) and still lands on the arc. (Sorry for any confusion but you have to be very direct when dealing with illogical conspiracy theories which are not even inside the red end ping area)
|Quoting nupogodi (Reply 212):|
I agree. Technically they could have flown in circles for hours and then intersected the 0811L arc fairly close to Malaysia. But this does not agree with the INMARSAT statement that the aircraft was flying away from the satellite the entire time. By calculating a straight-line distance between arcs, it is possible to calculate a straight-line speed. If that speed varies between pings, you can assume they either slowed down/sped up on purpose or that they made course changes. If that speed is constant, you can assume they are flying in a straight line, or making the exact same course changes each time between pings, which is unlikely.
So, if the data points to a constant speed, then a straight shot from the last radar contact with the fuel range in mind is the most plausible scenario to examine. This does not take their altitude into account as it is unknown, or any other factors that might affect range - so there are truly very many possibilities still left to explore, if this comes up empty.
I think I got a bit fed up with the far north west theories and lopped off a bunch of pre-conditions I used to say because they get distorted in all the wrong ways. Only the furthest points on the arc from the start require a direct path. Anything shorter allows for increasing amounts of wiggle room. The plane still has to end up on the arc by the end and it is unlikely it could fly close to the earth/water, land in a hidden airfield, or shadow another airliner off into the far west and still make it to the arc.
Although as we know inmarsat shows it moving fairly constantly so any major deviations would have been seen and circling is isn't going to produce a consistent distance/speed away from the sat. Anything other than a normal cruise would reduce efficiency and tighten the search to the near areas. (Which is well away from all the conspiracy landing sites and the such)[Edited 2014-03-21 08:49:30]
|Quoting cand (Reply 214):|
I was reading about the 777: It has 3 VHF units, 2 HF units, 1 SATCOM, 3 panels to control them. Plus ACARS and ADS. All these are powered from 4 DC busses, which are powered from 2 inter-changable AC busses. From all these, when both main alternators and the APU-driven generator fail, the one to shed is the SATCOM. So how come we still have SATCOM working and none of the others?
What is the layout of the electrical bay any-ways (the rack positions and such for each system) Any complete wire harness diagrams to stare at.[Edited 2014-03-21 08:53:30]
|Quoting hivue (Reply 217):|
The SATCOM communications box never lost its supply of power and was never actively turned off (breaker pulled).
You would think they would pull the power on everything related to black boxes, satcom, vhf, hf if they knew what they were doing but I guess if they just did stuff from the cockpit it would just be ACARS, transponder, and not the satcom modem itself. (In the 777 is the CVR/DFDR circuit breakers not in the cockpit because if that is the case then that is good for the chances of the recorders still having something even if everything else was deliberate)[Edited 2014-03-21 08:56:53]
|Quoting DTWPurserBoy (Reply 219):|
Since it appears that the current is basically eastward, I would expect some debris to start to wash ashore before too much longer. I cannot believe the thoroughnees of this investigation. It got off to a slow start I think due to a lack of cooperation between nationalities but now appears to be spearheaded by the Australians who have to be very careful of their political and business ties to the Malaysians and Indonesians.
With the entire world watching it would be nice to have some resolution, especially for the families of the missing.
Basically eastward and directly eastward are two different things near the shore lines according to a chart from an earlier thread the prevailing currents diverge and it could send debris in two direction away from land (Or it could make it through). After that it might very well end up in those "garbage patches" in the middle of the oceans which are kinda huge really. But that being said the AMSA search communication has been excellent and they post updates regularly and almost as they happen without making highly confusing statements.
Everything should be focused on finding the plane as fast as possible for the families and to ensure that this doesn't happen again regardless of the ultimate cause.
[Edited 2014-03-21 09:02:19]